How To create object of SOAP in C# windows application?

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C#

WinMobile

Visual-Studio

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1.Which directive should be included to import SOAP?

I have the following code which is used in java.But i want to create an object of Soap in C#.So can anyone help me to get me out of this?
PLZ..I want to use it in my project....

SoapObject request5 = new SoapObject(NAMESPACE3, METHOD_NAME5);
request5.addProperty("args",this.strStockid);

SoapSerializationEnvelope envelope5 = new SoapSerializationEnvelope(SoapEnvelope.VER11);
envelope5.setOutputSoapObject(request5);
HttpTransportSE androidHttpTransport5 = new HttpTransportSE(URL3);